Win.Downloader.97183-1 — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 6e01bde6eed5b71a…

MALICIOUS

Office (OLE) / .DOC

195.0 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: a49134a7fce8d8127a9590c69e9cccaa SHA-1: 47c352e8538e40952341e037a2012c82cd6161a3 SHA-256: 6e01bde6eed5b71a143527eba6b2e69086f226f0d260a84350facf75719235d1
622 Risk Score

Malware Insights

Win.Downloader.97183-1 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample exploits CVE-2006-6456 in Microsoft Word, a known vulnerability for client execution. It contains an embedded PE executable and references to APIs like CreateProcess, WriteProcessMemory, and CreateRemoteThread, indicating it likely downloads and executes a secondary payload. The presence of cmd.exe and suspicious command-line tokens further suggest execution of downloaded content.

Heuristics 14

  • CVE-2006-6456 — Microsoft Word malformed table SPRM critical CVE exact CVE_2006_6456
    WordDocument contains a malformed table border-color SPRM in the CVE-2006-6456 shape: a valid table-SPRM cluster is followed by an invalid high-byte 0xFF SPRM where Word expects a normal sprmTBrc*Cv record. Vulnerable Word 2000/2002/2003 parsers corrupt memory while handling this malformed data structure.
  • Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY
    Reference to WriteProcessMemory API
  • Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD
    Reference to CreateRemoteThread API
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Downloader.97183-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Downloader.97183-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 199,680 bytes but its declared streams total only 94,801 bytes — 104,879 bytes (53%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://%s:%d/net/B%s/search%s.php
    • http://%s:%d/net/B%s/serinfo
    • http://about:blank

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_000213fc.exe
7e5003a8fb08069c849daf4d2f74b7ab1a58ea84e0c2ca35027682cc1873dec6		 embedded-pe Office MZ+PE at offset 0x213FC 63492 bytes
Detection
ClamAV: Win.Downloader.97183-1
Obfuscation or payload: unlikely

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